gecko-dev/ipc/glue/SharedMemory.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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#include <math.h>
#include "nsIMemoryReporter.h"
#include "mozilla/ipc/SharedMemory.h"
namespace mozilla {
namespace ipc {
static PRInt64 gShmemAllocated;
static PRInt64 gShmemMapped;
static PRInt64 GetShmemAllocated(void*) { return gShmemAllocated; }
static PRInt64 GetShmemMapped(void*) { return gShmemMapped; }
NS_MEMORY_REPORTER_IMPLEMENT(ShmemAllocated,
"shmem/allocated",
"Shmem bytes accessible (not necessarily mapped)",
GetShmemAllocated,
nsnull)
NS_MEMORY_REPORTER_IMPLEMENT(ShmemMapped,
"shmem/mapped",
"Shmem bytes mapped into address space",
GetShmemMapped,
nsnull)
SharedMemory::SharedMemory()
: mAllocSize(0)
, mMappedSize(0)
{
// NB: SharedMemory is main-thread-only at the moment, but that may
// change soon
static bool registered;
if (!registered) {
NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemAllocated));
NS_RegisterMemoryReporter(new NS_MEMORY_REPORTER_NAME(ShmemMapped));
registered = true;
}
}
/*static*/ size_t
SharedMemory::PageAlignedSize(size_t aSize)
{
size_t pageSize = SystemPageSize();
size_t nPagesNeeded = size_t(ceil(double(aSize) / double(pageSize)));
return pageSize * nPagesNeeded;
}
void
SharedMemory::Created(size_t aNBytes)
{
mAllocSize = aNBytes;
gShmemAllocated += mAllocSize;
}
void
SharedMemory::Mapped(size_t aNBytes)
{
mMappedSize = aNBytes;
gShmemMapped += mMappedSize;
}
void
SharedMemory::Unmapped()
{
NS_ABORT_IF_FALSE(gShmemMapped >= PRInt64(mMappedSize),
"Can't unmap more than mapped");
gShmemMapped -= mMappedSize;
mMappedSize = 0;
}
/*static*/ void
SharedMemory::Destroyed()
{
NS_ABORT_IF_FALSE(gShmemAllocated >= PRInt64(mAllocSize),
"Can't destroy more than allocated");
gShmemAllocated -= mAllocSize;
mAllocSize = 0;
}
} // namespace ipc
} // namespace mozilla